Low-voltage cable branch box with protection structure at wire inlet

Abstract

The invention discloses a low-voltage cable branch box with protection structures at wire inlets, and belongs to the technical field of cable branch boxes, the low-voltage cable branch box comprises a box body, the interior of the box body is fixedly connected with a mounting rack for mounting electrical appliance elements through bolts, the bottom of the box body is provided with a plurality of wire inlets distributed in a linear array, and the wire inlets are arranged in the box body. The bottom of the inner wall of the box body is fixedly connected with a fixing frame corresponding to each wire inlet, and the front and back surfaces of the fixing frame are movably provided with plugging plates in a penetrating manner. The plugging plate is arranged to plug the wire inlet, and the gap sealing mechanism is arranged to fill and seal the gap between the cable and the plugging plate, so that external humid gas cannot enter the box body from the wire inlet, and when the sealing door of the box body is in a closed state, the whole branch box can be in a totally closed state; dust or humid gas in external air is prevented from entering the branch box, and electronic components in the branch box are well protected.

Description

Technical Field

[0001] The present invention relates to the technical field of cable distribution boxes, and particularly to a low-voltage cable distribution box with a protective structure at the incoming line port. Background Art

[0002] A low-voltage cable tapping box is a device used to tap, branch, connect, and convert circuits in a cable line, and is widely used in three-phase low-voltage power transmission and distribution systems in outdoor public places such as substations, both sides of urban streets, residential communities, and high-rise buildings.

[0003] For example, a Chinese patent with the application number: 202121165251.7 discloses a new type of heat-dissipating low-voltage cable distribution box in the technical field of power engineering, which includes a cable distribution box. A power distribution box door is installed on one side of the cable distribution box, heat dissipation holes are opened on both sides, a rain shield is installed on the top, and an anti-slip rubber pad is installed on the bottom. Load-bearing blocks are installed on the inner walls on both sides of the cable distribution box and are fixed by screws. A pulley limit bar and a rack are installed between the two load-bearing blocks. Pulley grooves are opened on both sides of the rack, pulleys are installed inside the pulley grooves, a pulley shaft is installed at the center of the pulley, a pulley shaft fixing piece is installed at one end of the pulley shaft, and a motor outer protection shell is installed on the top of the pulley shaft. A gear motor and a fan motor are installed inside the motor outer protection shell and are limited by motor limit blocks. Their output shafts are respectively installed with gears and fans. This device dissipates heat by means of air cooling, and the fan moves horizontally back and forth through the gears and pulley bars, not limited to dissipating heat at one position, making the heat dissipation more thorough.

[0004] Another example is a Chinese patent with the application number: 202322194683.6, which discloses a new type of low-voltage cable transfer and distribution box in the technical field of distribution boxes, including a distribution box body. A fixing plate and a partition plate are horizontally and fixedly arranged on the inner side wall. A plurality of grooves are opened on the front side of the partition plate. A cable inlet is opened on the side wall of the distribution box body, and a heat dissipation port is arranged above the cable inlet; a wire passing sleeve ring is installed at the cable inlet, and the top wall of the wire passing sleeve ring is communicated with the heat dissipation port; a heat dissipation component is arranged at the heat dissipation port, and the heat dissipation component is used to dissipate heat inside the distribution box body and the wire passing sleeve ring. This device solves the problem of poor heat dissipation on the surface of the cable due to the lack of a wire splitting structure in the prior art and is suitable for cable transfer and branching.

[0005] At present, most of the low-voltage cable distribution boxes on the market rely on ventilation and heat dissipation methods to cool the electrical components inside the distribution box. Ventilation and heat dissipation are inseparable from the heat dissipation ports, and the distribution box usually also has an inlet port. Due to the existence of the heat dissipation port and the inlet port, the distribution box cannot be in a fully enclosed state. In the case of a relatively high humidity in the external environment, the humid gas in the external air is likely to enter the distribution box from the position of the heat dissipation port or the inlet port. Once the humidity inside the distribution box is too high, condensation may occur, which is extremely likely to cause short circuits or damage to the electrical components inside the distribution box, and is not conducive to the long-term efficient and stable operation of the distribution box.

[0006] Therefore, it is necessary to provide a low-voltage cable distribution box with a protective structure for the inlet port to solve the above technical problems. Summary of the Invention

[0007] The purpose of the present invention is to provide a low-voltage cable distribution box with a protective structure for the inlet port to solve the problems raised in the above background technology.

[0008] To achieve the above objectives, the present invention is realized through the following technical solutions: A low-voltage cable distribution box with a protective structure for the inlet port, including a box body, the inside of the box body is fixedly connected with a mounting rack for installing electrical components by bolts, and a sealed box door is hingedly installed on the front of the box body. A PLC controller and a temperature sensor are also arranged on one side inside the box body. A plurality of inlet ports are arranged at the bottom of the box body in a linear array. Fixed frames are fixedly connected to the bottom of the inner wall of the box body at positions corresponding to each inlet port. Plugging plates are movably penetrated through the front and back of the fixed frame. The plugging plates are used to block and seal the inlet ports. An adjusting mechanism and a guiding mechanism are arranged between the two plugging plates. Gap sealing mechanisms are arranged on the opposite sides of the two plugging plates. The gap sealing mechanisms are used to fill and seal the gaps between the plugging plates and the cables. V-shaped clamping plates are arranged on the opposite sides of the two plugging and sealing mechanisms. The V-shaped clamping plates are used to clamp the cables passing through the inlet ports;

[0009] A semiconductor refrigeration sheet is fixedly penetrated through one side of the box body. A heat dissipation mechanism is arranged on one side of the box body at a position corresponding to the semiconductor refrigeration sheet. The heat dissipation mechanism is used to cool the heat dissipation end of the semiconductor refrigeration sheet;

[0010] Through the setting of the plugging plates, the position of the inlet port can be blocked. And through the setting of the gap sealing mechanisms, the gaps between the cables and the plugging plates can be filled and sealed, so as to ensure that the external humid gas will not enter the box body from the position of the inlet port. Furthermore, when the sealing door of the box body is in the closed state, the entire cable distribution box can be in a fully enclosed state, preventing dust or humid gas in the external air from entering the distribution box, and playing a good protective role for the electronic components inside the distribution box.

[0011] As a further description of the above technical solution: The heat dissipation mechanism includes a fixed frame fixedly installed on one side of the box body. A U-shaped dust-proof net is embedded and installed between the bottom, front, and back of the fixed frame. On the side of the inner wall of the fixed frame away from the box body, a heat dissipation fan is fixedly installed. The heat dissipation fan is arranged opposite to the heat dissipation end of the semiconductor refrigeration sheet. The heat dissipation fan consists of a driving motor and a fan blade, and the fan blade is coaxially and fixedly installed on the output end of the driving motor.

[0012] As a further description of the above technical solution: The heat dissipation end of the semiconductor refrigeration sheet is located outside the box body, and the refrigeration end is located inside the box body. The heat dissipation end and the refrigeration end of the semiconductor refrigeration sheet are respectively fixedly connected with heat dissipation fins and cold dissipation fins. By setting the semiconductor refrigeration sheet, the internal environment of the branch box is cooled, replacing the traditional ventilation and heat dissipation method. There is no need to open a heat dissipation port on the branch box, thereby preventing the situation that external dust or humid gas enters the inside of the branch box from the heat dissipation port.

[0013] As a further description of the above technical solution: The adjusting mechanism includes two threaded sleeves, which are respectively fixedly installed on the tops of the two plugging plates. The same bidirectional lead screw is threadedly connected inside the two threaded sleeves. The bidirectional lead screw is rotatably installed on the inner wall of the fixed frame, and one end of the bidirectional lead screw rotatably penetrates the fixed frame and is fixedly connected with an adjusting handle.

[0014] As a further description of the above technical solution: The guiding mechanism includes two guiding rings, which are respectively fixedly installed on the bottoms of the two plugging plates. The same guiding rod is movably inserted inside the two guiding rings. The guiding rod is fixedly installed between the front and back of the inner wall of the fixed frame. The adjusting mechanism and the guiding mechanism are used in cooperation to adjust the distance between the two plugging plates to separate or close the two plugging plates.

[0015] As a further description of the above technical solution: The gap sealing mechanism includes a sealing filling airbag and an inflation cylinder fixedly installed on the plugging plate. An inflation piston is movably connected inside the inflation cylinder. One end of the inflation piston is fixedly connected with a push rod, and the other end of the push rod movably penetrates the inflation cylinder and is fixedly connected with a trigger plate. A deflation spring is fixedly connected between the trigger plate and the inflation cylinder. A charging and discharging pipe is fixedly communicated between the end of the inflation cylinder away from the trigger plate and the sealing filling airbag.

[0016] As a further description of the above technical solution: The V-shaped clamping plate is fixedly installed on the side of the trigger plate away from the inflation cylinder.

[0017] As a further description of the above technical solution: A rainwater collection and flushing mechanism is fixedly installed on the top of the box body, and the rainwater collection and flushing mechanism is used to collect rainwater and flush the U-shaped dust-proof net.

[0018] As a further description of the above technical solution: The rainwater collection and flushing mechanism includes a rainwater collection box fixedly installed on the top of the box body. A filter screen is fixedly connected between the two sides of the inner wall of the rainwater collection box. One side of the rainwater collection box close to the heat dissipation mechanism is fixedly communicated with a water supply pipe. The other end of the water supply pipe penetrates through the fixed frame and is rotationally communicated with a water storage cylinder through a sealing bearing. A plurality of drain pipes are fixedly communicated with the outer surface of the water storage cylinder. The water storage cylinder is fixedly installed on the fan blade of the heat dissipation fan and is coaxially fixedly connected with the fan blade. An inclined water guiding slope is arranged at the bottom of the inner wall of the rainwater collection box, and the end close to the water supply pipe is the lower part of the slope, and the end far from the water supply pipe is the upper part of the slope;

[0019] In practical applications, the rainwater collection box is provided to collect rainwater, and the filter screen is used to filter and intercept impurities such as leaves that fall into the rainwater collection box. The collected rainwater flows into the water storage cylinder through the water supply pipe. The water storage cylinder is coaxially fixedly installed on the fan blade in the heat dissipation fan, so that the rotation of the fan blade drives the water storage cylinder to rotate. Under the action of centrifugal force, the water in the water storage cylinder is thrown towards the U-shaped dust-proof net through the drain pipes, thereby realizing the reverse flushing of the dust and impurities adsorbed on the outer surface of the U-shaped dust-proof net, improving the cleanliness of the outer surface of the U-shaped dust-proof net, facilitating the flow of gas, and being beneficial to the heat dissipation of the heat dissipation end of the semiconductor refrigeration sheet by the heat exchange between the heat in the fixed frame and the external gas, thereby improving the heat dissipation effect of the semiconductor refrigeration sheet.

[0020] As a further description of the above technical solution: Sealing rings are embedded at the bottom of the inner wall of the box body and outside each wire inlet. The plugging plate is located on the top of the sealing ring and is arranged in an interference fit with the sealing ring. The setting of the sealing ring can improve the sealing performance between the plugging plate and the bottom of the inner wall of the box body, and prevent dust or humid gas in the external air from entering the branch box through the gap between the bottom of the plugging plate and the bottom of the inner wall of the box body when the plugging plate seals the wire inlet.

[0021] The present invention has the following beneficial effects:

[0022] 1. Through the setting of the plugging plate, the position of the wire inlet can be blocked, and through the setting of the gap sealing mechanism, the gap between the cable and the plugging plate can be filled and sealed, so as to ensure that external humid gas will not enter the box body from the position of the wire inlet. Furthermore, when the sealing door of the box body is in the closed state, the entire cable branch box can be in a fully enclosed state, preventing dust or humid gas in the external air from entering the branch box and playing a good protective role for the electronic components in the branch box.

[0023] 2. By setting a semiconductor refrigeration chip, the internal environment of the branch box is cooled, replacing the traditional ventilation and heat dissipation method. There is no need to open a heat dissipation port on the branch box, thus preventing external dust or humid gas from entering the branch box through the heat dissipation port.

[0024] 3. Through the setting of the heat dissipation mechanism, the heat dissipation end of the semiconductor refrigeration chip can be cooled to improve the heat dissipation effect of the heat dissipation end of the semiconductor refrigeration chip, and then improve the refrigeration effect of the refrigeration end of the semiconductor refrigeration chip, so as to ensure the cooling effect of the semiconductor refrigeration chip on the internal electrical components of the branch box, prevent the electrical components from being damaged due to excessive temperature, and provide a comfortable working environment for the long-term, efficient and stable operation of the electrical components.

[0025] 4. Through the setting of the rainwater collection box, rainwater is collected, and impurities such as leaves falling into the rainwater collection box are filtered and intercepted by a filter screen. The collected rainwater flows into the water storage cylinder through a water supply pipe, and the water storage cylinder is coaxially and fixedly installed on the fan blade in the heat dissipation fan. Thus, the rotation of the fan blade drives the water storage cylinder to rotate. Under the action of centrifugal force, the water in the water storage cylinder is thrown towards the U-shaped dust-proof net through a drain pipe, so as to realize the reverse flushing of the dust and impurities adsorbed on the outer surface of the U-shaped dust-proof net, improve the cleanliness of the outer surface of the U-shaped dust-proof net, facilitate the flow of gas, and is conducive to the heat in the fixed frame to circulate with the outside gas for heat dissipation, thereby improving the heat dissipation effect of the heat dissipation end of the semiconductor refrigeration chip. Description of the Drawings

[0026] Figure 1 It is a three-dimensional schematic diagram of the overall structure of a low-voltage cable branch box with a protection structure at the inlet;

[0027] Figure 2 It is another three-dimensional schematic diagram of the overall structure of a low-voltage cable branch box with a protection structure at the inlet;

[0028] Figure 3 It is a three-dimensional schematic diagram of the structures such as the rainwater collection box and the semiconductor refrigeration chip of a low-voltage cable branch box with a protection structure at the inlet proposed by the present invention;

[0029] Figure 4 It is a three-dimensional schematic diagram of the structures such as the inlet and the sealing ring of a low-voltage cable branch box with a protection structure at the inlet proposed by the present invention;

[0030] Figure 5 It is a three-dimensional schematic diagram of the structures such as the fixing frame and the blocking plate of a low-voltage cable branch box with a protection structure at the inlet proposed by the present invention;

[0031] Figure 6Schematic three-dimensional view of structures such as the fixing frame and V-shaped clamping plate of a low-voltage cable distribution box with a protective structure at the inlet

[0032] Figure 7 Another perspective three-dimensional view of structures such as the fixing frame and V-shaped clamping plate of a low-voltage cable distribution box with a protective structure at the inlet proposed by the present invention

[0033] Figure 8 Schematic three-dimensional view of structures such as the adjustment mechanism and guiding mechanism of a low-voltage cable distribution box with a protective structure at the inlet proposed by the present invention

[0034] Figure 9 Schematic three-dimensional view of structures such as the plugging plate and inflator of a low-voltage cable distribution box with a protective structure at the inlet proposed by the present invention

[0035] Figure 10 Exploded view of structures such as the inflator and inflation piston of a low-voltage cable distribution box with a protective structure at the inlet proposed by the present invention

[0036] Figure 11 Schematic view of the rainwater collection and flushing mechanism of a low-voltage cable distribution box with a protective structure at the inlet proposed by the present invention

[0037] Figure 12 Schematic view of the heat dissipation mechanism of a low-voltage cable distribution box with a protective structure at the inlet proposed by the present invention

[0038] In the figure:

[0039] 1. Box body; 2. Mounting frame; 3. Inlet; 4. Fixing frame; 5. Plugging plate;

[0040] 6. Adjustment mechanism; 601. Threaded sleeve; 602. Bidirectional lead screw; 603. Adjusting handle;

[0041] 7. Guiding mechanism; 701. Guide ring; 702. Guide rod;

[0042] 8. Gap sealing mechanism; 801. Sealing filling airbag; 802. Inflator; 803. Inflation piston; 804. Trigger plate; 805. Air release spring; 806. Inflation and deflation pipe; 807. Push rod;

[0043] 9. V-shaped clamping plate; 10. Semiconductor refrigeration sheet;

[0044] 11. Heat dissipation mechanism; 1101. Fixed frame; 1102. U-shaped dust-proof net; 1103. Heat dissipation fan;

[0045] 12. Rainwater collection and flushing mechanism; 1201. Rainwater collection tank; 1202. Filter screen; 1203. Water supply pipe; 1204. Water storage cylinder; 1205. Drain pipe;

[0046] 13. Sealing ring; 14. PLC controller; 15. Temperature sensor. Specific embodiments

[0047] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0048] As shown in the attached Figure 1 to the attached Figure 12 figure:

[0049] Embodiment 1: The present invention provides a low-voltage cable branch box with a protective structure at the inlet, including a box body 1. An installation rack 2 for installing electrical components is fixedly connected inside the box body 1 by bolts, and a sealed box door is hingedly installed on the front of the box body 1. A PLC controller 14 and a temperature sensor 15 are also arranged on one side inside the box body 1. The temperature sensor 15 is electrically connected to the PLC controller 14. A plurality of inlet ports 3 are arranged linearly in an array at the bottom of the box body 1. Fixed frames 4 are fixedly connected to the bottom of the inner wall of the box body 1 at positions corresponding to each inlet port 3. Plugging plates 5 are movably penetrated through the front and back of the fixed frames 4. The plugging plates 5 are used to block and seal the inlet ports 3. An adjusting mechanism 6 and a guiding mechanism 7 are arranged between the two plugging plates 5. Gap sealing mechanisms 8 are arranged on the opposite sides of the two plugging plates 5. The gap sealing mechanisms 8 are used to fill and seal the gaps between the plugging plates 5 and the cables. V-shaped clamping plates 9 are arranged on the opposite sides of the two plugging and sealing mechanisms. The V-shaped clamping plates 9 are used to clamp the cables passing through the inlet ports 3;

[0050] A semiconductor refrigeration sheet 10 is fixedly penetrated through one side of the box body 1. A heat dissipation mechanism 11 is arranged at a position corresponding to the semiconductor refrigeration sheet 10 on one side of the box body 1. The heat dissipation mechanism 11 is used to dissipate heat from the heat dissipation end of the semiconductor refrigeration sheet 10;

[0051] The arrangement of the sealing plate 5 can seal the position of the inlet 3. And through the arrangement of the gap sealing mechanism 8, the gap between the cable and the sealing plate 5 can be filled and sealed, so as to ensure that external humid gas will not enter the box body 1 from the position of the inlet 3. Furthermore, when the sealing door of the box body 1 is in the closed state, the entire cable distribution box can be in a fully enclosed state, preventing dust or humid gas in the external air from entering the distribution box and playing a good protective role for the electronic components in the distribution box.

[0052] The heat dissipation mechanism 11 includes a fixed frame 1101 fixedly installed on one side of the box body 1. A same U-shaped dust-proof net 1102 is embedded and installed among the bottom, the front and the back of the fixed frame 1101. A heat dissipation fan 1103 is fixedly installed on the side of the inner wall of the fixed frame 1101 far from the box body 1. The heat dissipation fan 1103 is arranged opposite to the heat dissipation end of the thermoelectric cooler 10. The heat dissipation fan 1103 is composed of a driving motor and fan blades. The fan blades are coaxially and fixedly installed on the output end of the driving motor. Both the thermoelectric cooler 10 and the heat dissipation fan 1103 are electrically connected to the PLC controller 14.

[0053] Through the arrangement of the heat dissipation mechanism 11, the heat dissipation end of the thermoelectric cooler 10 can be cooled, so as to improve the heat dissipation effect of the heat dissipation end of the thermoelectric cooler 10, and further improve the refrigeration effect of the refrigeration end of the thermoelectric cooler 10, thus ensuring the temperature reduction effect of the thermoelectric cooler 10 on the internal electrical components of the distribution box, preventing the electrical components from being damaged due to excessive temperature, and providing a comfortable working environment for the long-term, efficient and stable operation of the electrical components.

[0054] The heat dissipation end of the thermoelectric cooler 10 is located outside the box body 1, and the refrigeration end is located inside the box body 1. Heat dissipation fins and cold dissipation fins are respectively fixedly connected to the heat dissipation end and the refrigeration end of the thermoelectric cooler 10. Through the arrangement of the thermoelectric cooler 10, the internal environment of the distribution box is cooled, replacing the traditional ventilation and heat dissipation method, without the need to open a heat dissipation port on the distribution box, and thus preventing the situation that external dust or humid gas enters the inside of the distribution box from the heat dissipation port.

[0055] The adjusting mechanism 6 includes two threaded sleeves 601. The two threaded sleeves 601 are respectively fixedly installed on the tops of the two sealing plates 5. And the same bidirectional lead screw 602 is in threaded connection with the interiors of the two threaded sleeves 601. The bidirectional lead screw 602 is rotatably installed on the inner wall of the fixed frame 4. And one end of the bidirectional lead screw 602 rotatably penetrates through the fixed frame 4 and is fixedly connected with an adjusting handle 603.

[0056] The gap sealing mechanism 8 includes a sealing filling airbag 801 fixedly installed on the plugging plate 5 and an air inflation cylinder 802. An air inflation piston 803 is movably connected inside the air inflation cylinder 802. One end of the air inflation piston 803 is fixedly connected to a push rod 807. The other end of the push rod 807 movably penetrates through the air inflation cylinder 802 and is fixedly connected to a trigger plate 804. A deflation spring 805 is fixedly connected between the trigger plate 804 and the air inflation cylinder 802. A charging and discharging pipe 806 is fixedly communicated between the end of the air inflation cylinder 802 away from the trigger plate 804 and the sealing filling airbag 801. The V-shaped clamping plate 9 is fixedly installed on the side of the trigger plate 804 away from the air inflation cylinder 802. The outer surface of the air inflation piston 803 is set in interference fit with the inner wall of the air inflation cylinder 802.

[0057] A rainwater collection and flushing mechanism 12 is fixedly installed on the top of the box body 1. The rainwater collection and flushing mechanism 12 is used for collecting rainwater and flushing the U-shaped dust-proof net 1102.

[0058] Sealing rings 13 are embedded at the bottom of the inner wall of the box body 1 and outside each wire inlet 3. The plugging plate 5 is located on top of the sealing ring 13 and is set in interference fit with the sealing ring 13. Through the setting of the sealing ring 13, the sealing performance of the connection between the plugging plate 5 and the bottom of the inner wall of the box body 1 can be improved, and it can be avoided that when the plugging plate 5 plugs the wire inlet 3, dust or humid gas in the external air enters the branch box from the gap between the bottom of the plugging plate 5 and the bottom of the inner wall of the box body 1.

[0059] Working principle: When it is necessary to use the cable distribution box to branch the cable, the staff first pass the external cable through the inlet 3 into the interior of the box body 1, and make the cable located inside the box body 1 at an appropriate length for subsequent wiring operations. Subsequently, the staff rotate the adjusting handle 603 clockwise to drive the rotation of the bidirectional lead screw 602. Under the limiting action of the guiding mechanism 7 on the sealing plate 5 and the threaded sleeve 601, the two threaded sleeves 601 move towards the opposite side, thereby driving the two sealing plates 5 to move towards the opposite side, and driving the gap sealing mechanism 8 and the V-shaped clamping plate 9 to move synchronously until the V-shaped clamping plate 9 abuts against the surface of the cable in the inlet 3. Then continue to rotate the adjusting handle 603 to make the two sealing plates 5 continue to move towards the opposite side. At this time, since the V-shaped clamping plate 9 and the trigger plate 804 are restricted by the cable and cannot move, the inflator 802 continues to move towards the center position of the inlet 3, thereby reducing the distance between the trigger plate 804 and the inflator 802, and squeezing the air release spring 805 to make it in a compressed state and store energy. And the reaction force of the air release spring 805 on the V-shaped clamping plate 9 makes the V-shaped clamping plate 9 clamp and fix the cable passing through the inlet 3, improving the stability of the cable, which is beneficial to the connection stability between the cable and the electrical components in the box body 1. And the push rod 807 is used to push the inflation piston 803 to move in the inflator 802, and inject the gas in the inflator 802 into the interior of the sealing filling airbag 801 through the air charging and discharging pipe 806, making the sealing filling airbag 801 bulge. Continue to rotate the adjusting handle 603 until the two sealing plates 5 abut against each other, wrapping the outside of the cable. And the two inflated sealing filling airbags 801 fill and seal the gap between the sealing plate 5 and the cable. After the two sealing plates 5 abut against each other, the sealing ring 13 is used to seal the gap between the sealing plate 5 and the box body 1, ensuring that the external humid air will not enter the box body 1 from the position of the inlet 3. Thus, when the sealing door of the box body 1 is in the closed state, the entire cable distribution box can be in a fully enclosed state, preventing dust or humid air in the external air from entering the distribution box and playing a good role in protecting the electronic components in the distribution box;

[0060] By setting the temperature sensor 15, the temperature value inside the box body 1 can be monitored, and the monitored data is transmitted to the PLC controller 14. When the temperature inside the box body 1 reaches the preset value, the heat dissipation fan 1103 and the semiconductor refrigeration sheet 10 are turned on through the PLC controller 14. The refrigerating end of the semiconductor refrigeration sheet 10 refrigerates, and the setting of the heat dissipation fins is beneficial to accelerating the diffusion of the cold air generated by the refrigerating end of the semiconductor refrigeration sheet 10 into the box body 1. And the setting of the heat dissipation fins can increase the contact area between the heat dissipation end of the semiconductor refrigeration sheet 10 and the external air, thereby accelerating the heat dissipation effect. And the heat dissipation fan 1103 blows air on the heat dissipation fins to accelerate the gas flow rate and improve the heat dissipation effect on the heat dissipation end of the semiconductor refrigeration sheet 10.

[0061] Example Two: This example is basically the same as the previous one. The difference is that the rainwater collection and flushing mechanism 12 includes a rainwater collection tank 1201 fixedly installed on the top of the box body 1. A filter screen 1202 is fixedly connected between the two sides of the inner wall of the rainwater collection tank 1201. One side of the rainwater collection tank 1201 close to the heat dissipation mechanism 11 is fixedly communicated with a water supply pipe 1203. The other end of the water supply pipe 1203 penetrates through the fixed frame 1101 and is rotationally communicated with a water storage cylinder 1204 through a sealed bearing. A plurality of drain pipes 1205 are fixedly communicated with the outer surface of the water storage cylinder 1204. The water storage cylinder 1204 is fixedly installed on the fan blade of the heat dissipation fan 1103 and is fixedly connected coaxially with the fan blade.

[0062] An inclined water guiding slope is provided at the bottom of the inner wall of the rainwater collection tank 1201, and the end close to the water supply pipe 1203 is the lower part of the slope, and the end far from the water supply pipe 1203 is the upper part of the slope.

[0063] Through the setting of the rainwater collection tank 1201, rainwater is collected, and impurities such as leaves falling into the rainwater collection tank 1201 are filtered and intercepted by the filter screen 1202. The collected rainwater flows into the water storage cylinder 1204 through the water supply pipe 1203. The water storage cylinder 1204 is coaxially and fixedly installed on the fan blade in the heat dissipation fan 1103, so that the rotation of the fan blade drives the water storage cylinder 1204 to rotate. Under the action of centrifugal force, the water in the water storage cylinder 1204 is thrown towards the U-shaped dust-proof net 1102 through the drain pipe 1205, so as to realize the reverse flushing of the dust and impurities adsorbed on the outer surface of the U-shaped dust-proof net 1102, improve the cleanliness of the outer surface of the U-shaped dust-proof net 1102, facilitate the flow of gas, and is conducive to the heat in the fixed frame 1101 to be dissipated through the circulation of the external gas, thereby improving the heat dissipation effect on the heat dissipation end of the semiconductor refrigeration chip 10.

[0064] Example Three: This example is basically the same as the previous one. The difference is that the guiding mechanism 7 includes two guiding rings 701. The two guiding rings 701 are respectively fixedly installed at the bottoms of the two plugging plates 5, and the same guiding rod 702 is movably inserted into the two guiding rings 701. The guiding rod 702 is fixedly installed between the front and back of the inner wall of the fixed frame 4. By the cooperation of the guiding rod 702 and the guiding rings 701, the plugging plate 5 can be limited. Furthermore, when the adjusting mechanism 6 operates, the plugging plate 5 and the threaded sleeve 601 are limited, so that the plugging plate 5 can move along the axial direction of the guiding rod 702.

[0065] Although the embodiments of the present invention have been shown and described, it will be understood by those of ordinary skill in the art that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A low-voltage cable branch box with a protective structure at the incoming line port, comprising a box body (1), wherein an installation rack (2) for installing electrical components is fixedly connected inside the box body (1) by bolts, and it is characterized in that: A plurality of inlet ports (3) distributed in a linear array are formed in the bottom of the box body (1). Fixed frames (4) are fixedly connected to the bottom of the inner wall of the box body (1) at positions corresponding to each inlet port (3). Plugging plates (5) are movably penetrated and installed on the front and back of the fixed frame (4). The plugging plates (5) are used to plug and seal the inlet ports (3). An adjusting mechanism (6) and a guiding mechanism (7) are arranged between the two plugging plates (5). Gap sealing mechanisms (8) are arranged on the opposite sides of the two plugging plates (5). The gap sealing mechanisms (8) are used to fill and seal the gaps between the plugging plates (5) and the cables. V-shaped clamping plates (9) are arranged on the opposite sides of the two plugging and sealing mechanisms. The V-shaped clamping plates (9) are used to clamp the cables passing through the inlet ports (3). A semiconductor refrigeration sheet (10) is fixedly penetrated and installed on one side of the box body (1). A heat dissipation mechanism (11) is arranged on one side of the box body (1) at a position corresponding to the semiconductor refrigeration sheet (10). The heat dissipation mechanism (11) is used to dissipate heat from the heat dissipation end of the semiconductor refrigeration sheet (10).

2. The low-voltage cable distribution box with a protective structure at the incoming line port according to claim 1, wherein: The heat dissipation mechanism (11) includes a fixed frame (1101) fixedly installed on one side of the box body (1). The same U-shaped dust-proof net (1102) is embedded and installed among the bottom, front and back of the fixed frame (1101). A heat dissipation fan (1103) is fixedly installed on the side of the inner wall of the fixed frame (1101) away from the box body (1). The heat dissipation fan (1103) is arranged opposite to the heat dissipation end of the semiconductor refrigeration sheet (10).

3. The low-voltage cable distribution box with a protective structure at the incoming line port according to claim 2, characterized in that: The heat dissipation end of the semiconductor refrigeration sheet (10) is located outside the box body (1), and the refrigeration end is located inside the box body (1). Heat dissipation fins and cold dissipation fins are respectively fixedly connected to the heat dissipation end and the refrigeration end of the semiconductor refrigeration sheet (10).

4. A low-voltage cable distribution box with a protective structure at the incoming line port according to claim 1, characterized in that: The adjusting mechanism (6) includes two threaded sleeves (601). The two threaded sleeves (601) are respectively fixedly installed on the tops of the two plugging plates (5). The same bidirectional lead screw (602) is threadedly connected inside the two threaded sleeves (601). The bidirectional lead screw (602) is rotatably installed on the inner wall of the fixed frame (4). One end of the bidirectional lead screw (602) rotatably penetrates the fixed frame (4) and is fixedly connected to an adjusting handle (603).

5. A low-voltage cable distribution box with a protective structure at the incoming line port according to claim 1, characterized in that: The guiding mechanism (7) includes two guiding rings (701). The two guiding rings (701) are respectively fixedly installed on the bottoms of the two plugging plates (5). The same guiding rod (702) is movably inserted into the two guiding rings (701). The guiding rod (702) is fixedly installed between the front and back of the inner wall of the fixed frame (4).

6. The low-voltage cable distribution box with a protective structure at the incoming line port according to claim 1, characterized in that: The gap sealing mechanism (8) includes a sealing filling airbag (801) fixedly installed on the plugging plate (5) and an air inflation cylinder (802). An air inflation piston (803) is movably connected inside the air inflation cylinder (802). One end of the air inflation piston (803) is fixedly connected to a push rod (807). The other end of the push rod (807) movably penetrates through the air inflation cylinder (802) and is fixedly connected to a trigger plate (804). A deflation spring (805) is fixedly connected between the trigger plate (804) and the air inflation cylinder (802). An air charging and discharging pipe (806) is fixedly communicated between the end of the air inflation cylinder (802) far from the trigger plate (804) and the sealing filling airbag (801).

7. The low-voltage cable distribution box with a protective structure at the incoming line port according to claim 6, characterized in that: The V-shaped clamping plate (9) is fixedly installed on the side of the trigger plate (804) far from the air inflation cylinder (802).

8. A low-voltage cable distribution box with a protective structure at the incoming line port according to claim 1, characterized in that: A rainwater collection and flushing mechanism (12) is fixedly installed on the top of the box body (1). The rainwater collection and flushing mechanism (12) is used for collecting rainwater and flushing the U-shaped dust-proof net (1102).

9. The low-voltage cable distribution box with a protective structure at the incoming line port according to claim 8, characterized in that: The rainwater collection and flushing mechanism (12) includes a rainwater collection box (1201) fixedly installed on the top of the box body (1). A filter screen (1202) is fixedly connected between the two sides of the inner wall of the rainwater collection box (1201). A water supply pipe (1203) is fixedly communicated with one side of the rainwater collection box (1201) close to the heat dissipation mechanism (11). The other end of the water supply pipe (1203) penetrates through the fixed frame (1101) and is rotationally communicated with a water storage cylinder (1204) through a sealing bearing. A plurality of drain pipes (1205) are fixedly communicated with the outer surface of the water storage cylinder (1204).

10. A low-voltage cable distribution box with a protective structure at the incoming line port according to claim 1, characterized in that: A sealing ring (13) is embedded at the bottom of the inner wall of the box body (1) and outside each wire inlet (3). The plugging plate (5) is located on the top of the sealing ring (13) and is arranged in an interference fit with the sealing ring (13).

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